| Tonsillectomy group (n = 47) | 0.2 episodes (95% CI 0.07 to 0.34; SD* 0.46) |
| Adenotonsillectomy group (n = 46) | 0.1 episodes (95% CI 0.02 to 0.23; SD* 0.35) |
| Combined: tonsillectomy and adenotonsillectomy (n = 93) | 0.1 episodes (SD 0.41) |
| Control group (n = 54) | 0.2 episodes (95% CI 0.13 to 0.41; SD* 0.51) |
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